Screw and nut gearing



April 3, 1955 J. J. KEYSER SCREW AND NUT GEARING 2 Sheets-Sheet 1 Filed Sept. 28. 1950 Fig. I

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Alforners April 3, 1956 J. J. KEYSER 2,740,302

SCREW AND NUT GEARING Filed Sept. 28, 1950 2 Sheets-Sheet 2 Fig.2

y m TAM Alforne Y5 United States Patent 6 SCREW AND NUT GEARING Johann Jakob Keyser, Aara'u, Switzerland, assignor. to

Schiess Aktiengesellschaft, Dusseldorf-Oberkassel, Germany Application September 28, 1950,.Serial No. 187,173 Claims priority, application Switzerland October 29, 1949 2 Claims. (Cl. 74-4243) This invention relates to lifting and lowering motion for the spindle or ring rail of ring spinning or ring twisting frames.

With the conventional ring spinning and ring twisting frames, in which the spindle or ring rails are lifted or lowered by the rotation of a nut on a threaded shaft, the lifter nuts are embedded in a rail carrier within which they rotate, rigidly guided. Due to the considerable length and the heavy weight of the masses to be moved, the rigidly mounted lifter nuts are subjected to severe stresses resulting in a high wear on the parts sliding on each other and in a great amount of power being required. Besides, negligible relative displacements of the rail parts and their motion elements, as are likely to occur in actual service due to influence of heat, sinking down and load shifting, cause undue stressing, jamming and getting out of alignment so that the parts readily break.

The object of the present invention is to eliminate these drawbacks and to provide a lifting and lowering motion for spindle and ring rails respectively which ensures, with a minimum of power required, a smooth running even in the event of there being some small amount of play between the various machine parts. In accordance with the present invention, the threaded nut is, therefore, housed in a lifter slide, each part being independently guided on the threaded shaft. This arrangement protects the out from the detrimental effects of a rigid guide in the rail, as it permits some adjustment to any displacements of the parts relative to each other, such as are likely to occur in actual service through influence of heat, dust and wear. The connection between the lifter slide and the nut is established by means of a ball bearing which represents another feature of the invention and permits a compensation for any variations in the load resting thereon or any negligible dimensional changes in the parts moving one upon the other. The guide of the lifter slide and nut is rendered particularly advantageous if the threaded shaft is made with a square thread. The drive of the lifter nut is preferably arranged and supported so as to counteract the tilting moment arising when lifting the load carried by the nut.

Referring to the drawing which shows one embodiment of the invention:

Figure l is a cross-section through the lifting and lowering motion for the spindle rail of a ring spinning machine.

Figure 2 is a cross-section through the lifting and lowering motion for double-sided spindle rails of a ring spinning machine.

In the drawing like reference numerals indicate like parts.

Travelling up and down on the threaded shaft 1 which may form part of the machine frame is the nut 2 which has teeth cut into its outer circumference and is driven by the shaft 3 through the spur or worm or helical gear 4. By means of a gearing (not shown) the shaft 3 is given a rhythmical alternate clockwise and counter-clockwise rotation whereby the nut 2 is caused to rotate in two 2,740,302 Patented Apr. 3, 1956 2 directions so as to travel either up or down the threaded shaft 1.

The not 2 is housed in the lifter slide 5 carrying the spindle rail 7 secured to a bracket 6. The lifter slide 5 has guiding sleeves 8 and 9 respectively which are located above and below the nut 2 and tightly bear against the threaded shaft 1. In a sense the nut 2 is supported in the lifter slide 5 in a floating manner, that to say in such 'a way that it is exclusively guided 'by the shaft l and the thread It respectively, but not by th e lifte'rslide proper. Any displacement of load or misalignment of the parts to be moved, either in relation to each other or to the threaded shaft 1, will, therefore, have noeifect upon the not 2, but will be taken up by the ball bearing 11, the various balls of which will be subjected to a smaller or greater load according to the direction in which these changes take place. They may adjust themselves between the races 12, 13 so as to ensure the nut 2 to be constantly guided merely by the thread 10 of the shaft. A small air gap 14 at the lower end of the nut 2 is provided to avoid at this point, too, any jamming between the nut on the one hand and the lifter slide 5 U: its lower guiding sleeve 9 on the other hand. For the safe guiding of the lifter slide 5 and the nut 2, a square thread, as shown, is a particular advantage, because it has wide guiding surfaces on its outer surface and affords the least possibilities for dust and dirt to accumulate.

The driving shaft 3 with the worm or helical gear 4 is supported so as to counteract the tilting moment arising when lifting the load carried by the nut 2. Due to the weight of the spindle rail 7, a force (as indicated by the arrow a) is exerted upon the lifter slide 5 which is not permitted to have any effect upon the running of the nut 2. To achieve this, the shaft 3 is located underneath the load lever arm L-L and the teeth of the gear 4 and nut 2 are so designed that the nut 2 when lifting the load is supported from below.

In the double-sided system shown in Fig. 2, comprising two spindle rails 7, 7' mounted opposite each other on a common lifter slide 5, the same result is attained by arranging the shafts 3, 3' symmetrically in relation to the longitudinal axis of the threaded shaft 1. When lifting, the shafts 3, 3' rotate in the direction indicated by arrows, thereby relieving the nut 2.

By designing the lifting and lowering motion in accordance with the invention it is possible to equip spinning and twisting machines with movable ring and spindle rails of great length which can be moved from a single source of power through the continuous shaft 3 without any risk of jamming. The principle of the invention is analogously applicable to other devices of textile machines effecting an up and down motion, for example movable guide rods or drawing frames.

Of course, the invention is not restricted in its application to ring spinning and ring twisting machines, but can also be applied to other types of machine, such as slubbing and roving frames, flyer or cap spinning frames and other systems.

What I claim and wish to secure by Letters Patent is:

1. An arrangement for lifting and lowering the spindle or ring rail of spinning or twisting frames, which comprises in combination, a reciprocable lifter slide having a unilateral extension in horizontal direction for supporting spindles and being provided with two spaced cylindrical guiding surfaces coaxially arranged with regard to each other, a substantially vertical shaft having a threaded portion and being in sliding engagement with said spaced guiding surfaces, said shaft being secured against rotation and reciprocation, nut means engaging said threaded portion and being arranged between said spaced guiding surfaces in spaced relationship thereto, driving means "ice arranged within said lifter slide and operatively engaging said nut means for rotating the same, said nut means being guided by said threaded portion independently of said lifter slide, and anti-friction bearing means interposed between and having opposite surfaces engaged by said lifter slide and said nut means respectively, said driving means and said nut means engaging each other by gear means integral therewith and adapted to support said nut means from below when driving said nut means for lifting said lifter slide, to thereby at least partially counteract the bending moment exerted by said unilateral extension.

2. An arrangement for lifting and lowering the spindle or ring rail of spinning or twisting frames, which comprises in combination, a reciprocable lifter slide provided with two spaced guiding surfaces, a substantially verticai shaft secured against rotation, said shaft having spaced surface portions in sliding engagement with said spaced guiding surfaces and being provided with a threaded portion,

rotatable means threadedly engaging said threaded portion and being spaced from'the adjacent wall portions of said slide, and anti-friction bearing means interposed between and engaging said lifter slide and said rotatable means respectively while allowing the axis of rotation of said rotatable means to vary' its position slightly with regard to the longitudinal axis of said shaft.

References Cited inthe file of this patent UNITED STATES PATENTS Ambrose Dec. 6, 1904 Brown Oct. 4, 1949 

